Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....132.1910f&link_type=abstract
The Astronomical Journal, Volume 132, Issue 5, pp. 1910-1917.
Astronomy and Astrophysics
Astronomy
2
Stars: Binaries: Eclipsing, Stars: Binaries: Spectroscopic, Stars: Fundamental Parameters
Scientific paper
Our red-wavelength spectroscopic observations of HD 131861, a previously known single-line multiple system, span 20 years. Now lines of two components, the short-period F5 V primary and G8 V secondary, have been detected. The inner orbit is circular with a period of 3.5507439 days, while the outer orbit of the system has a period of 1642 days or 4.496 yr and a relatively low eccentricity of 0.10. Analysis of the Hipparcos data produces a well-determined astrometric orbit for the long-period system that has an inclination of 52°. Our photometric observations show shallow primary and secondary eclipses of the short-period pair, and eclipse solutions result in an inclination of 81°. Thus, the long- and short-period orbits are not coplanar. The mass of the unseen third component is 0.7 Msolar, corresponding to a mid-K dwarf. The total mass of the system, 3.08 Msolar, leads to a semimajor axis of 4 AU for the outer orbit. The F5 V primary is rotating more slowly than it would if it were synchronously rotating, while the G8 V secondary may be synchronously rotating. The lithium abundance of the F5 V primary is similar to the initial lithium abundance found for Population I dwarfs and so indicates no significant dilution.
Barlow D. J.
Fekel Francis C.
Henry Gregory W.
Pourbaix Dimitri
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